I would rather be working on my 62 chevy c-10, but my newer truck and i have a difference of opinion. I have a 2003 GMC Sierra 4WD 5.3L V8. Today as my wife was driving the truck and turning into a parking lot, the ABS light came on, and a funny noise was heard from underneath the truck.

I have located the noise, according the Haines Repair Manual, its called a Electro-Hydaulic Control Unit (EHCU). Anyway, this unit runs continously even when the truck is turned off. Any suggestions!?

The unit is clean and dry from foreign materials. I tried taking my truck to a couple local part stores (AutoZone & Advance) Neither one can check my codes, because of ABS lights are considered (Soft) codes. I have unplugged the unit so it will not continuously run. However now as some probably know it sounds bells intermitanly, making me think there is a short somewhere in the circuit.

I believe i can probably fix the problem myself but i don't want to just throw money at it. (That never seems to work.) And i don't want to be fooled if i take it to a dealer or service shop and again throw good money after bad.

I am hoping someone else has had this problem, and can help out. Any suggestions would be appreciated.